On your desktop, double-click the shortcut of Discord to open it. Run your game again. This is often enough to fix the overlay not working issue.

Discord has received a new update to its desktop app and Game Overlay, making it more customizable and perform better.

Discord's latest update has ruffled more than a few feathers, but automatically turning on the new Game Overlay is the change I couldn't get behind.

Discord announced on Tuesday that it rebuilt its Overlay feature from the ground up. The new Overlay makes streaming games on Discord more user-friendly on the streamer’s end.